21772263671 has 4 divisors (see below), whose sum is σ = 22078915344. Its totient is φ = 21465612000.

The previous prime is 21772263637. The next prime is 21772263673. The reversal of 21772263671 is 17636227712.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21772263671 - 2³⁰ = 20698521847 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21772263673) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 153325730 + ... + 153325871.

It is an arithmetic number, because the mean of its divisors is an integer number (5519728836).

Almost surely, 2^21772263671 is an apocalyptic number.

21772263671 is a deficient number, since it is larger than the sum of its proper divisors (306651673).

21772263671 is an equidigital number, since it uses as much as digits as its factorization.

21772263671 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 306651672.

The product of its digits is 296352, while the sum is 44.

The spelling of 21772263671 in words is "twenty-one billion, seven hundred seventy-two million, two hundred sixty-three thousand, six hundred seventy-one".